[GHC] #9407: Program produces different output when compiled with -O

[GHC]

#9407: Program produces different output when compiled with -O
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        Reporter:  arotenberg        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.3
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rdragon):

 It looks like this issue has been fixed in GHC 7.10.2 or before. I can
 reproduce the problem with GHC 7.8.3, but not with 7.10.2. In both cases I
 use the 64-bit version.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9407#comment:7>
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